Arithmetic device

Abstract

An arithmetic device includes a first arithmetic chip configured to perform arithmetic processing for realizing driving assistance functions of a vehicle, and a second arithmetic chip configured to perform arithmetic processing for realizing the driving assistance functions of the vehicle, wherein, among the driving assistance functions, second functions realized by the first arithmetic chip along with the second arithmetic chip includes a function of providing at least some of first functions realized without depending on arithmetic processing of the second arithmetic chip in a state in which a task imposed on a driver has been reduced, as compared to the first functions.

What is claimed is: 
     
         1 . An arithmetic device comprising:
 a first arithmetic chip configured to perform arithmetic processing for realizing driving assistance functions of a vehicle; and   a second arithmetic chip configured to perform arithmetic processing for realizing the driving assistance functions of the vehicle,   wherein, among the driving assistance functions, second functions realized by the first arithmetic chip along with the second arithmetic chip include a function of providing at least some of first functions realized without depending on arithmetic processing of the second arithmetic chip in a state in which a task imposed on a driver has been reduced, as compared to the first functions.   
     
     
         2 . The arithmetic device according to  claim 1 , further comprising a third arithmetic chip configured to receive a result of arithmetic processing of the first arithmetic chip and a result of arithmetic processing of the second arithmetic chip and to determine whether or not the driving assistance functions are executable,
 wherein the third arithmetic chip has a higher functional safety level than the first arithmetic chip and the second arithmetic chip.   
     
     
         3 . The arithmetic device according to  claim 1 ,
 wherein the first functions include at least an inter-vehicle distance keeping function, a track keeping function, and a deceleration-for-obstacle function, and the second arithmetic chip performs arithmetic processing for determining whether or not the task can be reduced.   
     
     
         4 . The arithmetic device according to  claim 3 ,
 wherein a result of matching between a position of the vehicle and map information is input to the second arithmetic chip, and the second arithmetic chip performs arithmetic processing for determining whether or not the task can be reduced on the basis of the matching result.   
     
     
         5 . The arithmetic device according to  claim 1 ,
 wherein the second arithmetic chip performs arithmetic processing for alternative control when a driver's physical condition deteriorates or when soundness of a system including the arithmetic device deteriorates.   
     
     
         6 . An arithmetic device comprising:
 a first arithmetic chip configured to perform arithmetic processing for realizing driving assistance functions of a vehicle; and   a board on which the first arithmetic chip is mounted,   wherein the board is provided with a free area for mounting a second arithmetic chip configured to perform arithmetic processing for realizing the driving assistance functions of the vehicle, the first arithmetic chip realizes first functions among the driving assistance functions without depending on arithmetic processing of the second arithmetic chip, and when the second arithmetic chip is mounted on the board, the first arithmetic chip realizes at least some of the first functions along with the second arithmetic chip in a state in which a task imposed on a driver has been reduced.